Wrong vs right
Two deals can show the same cap with different hidden expenses. Match expense definitions before you argue “better.”
For rental cash flow, the expensive mistakes are silent omissions: vacancy, taxes, fees, or timeline.
Why fights persist
Rechecking math on the wrong table feels productive; rebuilding the table from documents is what fixes decisions.
Related lesson and Another angle are two sanity passes. Use both when money is large.
Check your numbers now
Classic slip
Mistake: pro forma rent from the seller with zero collection loss. Fix: plug your own vacancy month and late-pay rate.
Fix
| Wrong comfort | What fixes rental cash flow |
|---|---|
| “Numbers match” | Definitions match |
| “I’m careful” | Line-by-line audit |
| “Close enough” | Not for six-figure choices |
Cash Flow: same words, different spreadsheets Align lines, then compare
Bracket test
Core lesson
Related: Cash Flow. To test sensitivity, change one input at a time in the calculator.
Use the calculator
FAQ
- Where is the main lesson?
Cash Flow is the hub with related lessons linked from it.
- Which calculator should I open first?
Use Rent vs buy or Home afford for housing tradeoffs; Loan or Amortization for payments and equity.